Spain's posted a current account surplus of 3.45 billion euros ($3.77 billion) in September, compared to a surplus of 451 million euros in the same month a year earlier, the Bank of Spain said on Thursday.

That compared to a surplus of 4.19 billion euros in August, according to the central bank. ($1 = 0.9156 euros) (Reporting by Maria Luiza Amaral; Editing by Emma Pinedo)